Fuel pump



Dec. 10, 1929. c, WQMQKINLEY FUEL PUMP Filed June 23, 1928' PatentedDec. 10, 1929 UNITED STATES PATENT OFFICE I CHARLES w. MCKINLE'Y, orFLINT, MICHIGAN, ASSIGNOR TO A c SPARK I-ILUG com- PANY, or FLINT,MICHIGAN, A COMPANY or MICHIGAN FUEL rum? Application filed June 23,

Although this invention is referred to as a fuel pump, it relates moreparticularly to a specific thrust-refusing connection between areciprocated actuating element and a diaphragm stemor equivalent elementattached to a pump diaphragm or other re'ciprocatory pumping elementadapted to receive a variable stroke, said stroke being diminished invgesponse to pressure within a pump cham- The principles of thisinvention being applicable to various types of fuel pumps, or the like,the illustrated pump is of the same general type asthat described andclaimed in a pending application of Abraham M. Babitch, Serial No.123,370, filed July 19, 1926; but the present invention may be regardedas relating particularly to the use of a flexible link, loop or the likein the imparting of variable intake strokes to a pumping element, and topreferred means and methods of securing and using an interme- I diatethrust-refusing element of the general character referred to.

Other objects of this invention may be best appreciated from thefollowing description of specific embodiments thereof, taken inconnection with the appended claims and the accompanying drawings. I

Fig. 1 may be referred to as an elevational view, with parts shown insubstantially median section.

Fig. 2 is a view comparable with a central portion of Fig. 1, butshowing features 0 modification. I v

Fig. 3 is a detail view showing one type of flexible link suitable foruse as suggested in Fig. 2. I

Fig. 4: is a detail view corresponding to a central portion of Fig. 2,but showing an alternative construction in which a link similar to thatshown in Fig. 3, but imperforate, may be employed.

Referring first to Fig. 1, 10 and 11 being respectively a body castingand a cover cast- 1928. Serial No. 287,754.

lever 17 is shown as pivoted at 18 and as adapted to be continuouslyengaged by a reciprocatory or rotating driven element such as a cam 19upon a shaft 20, and an inner end 21 of said lever may be provided withmeans such as a compression spring retained between cupped plates 22 and23, tending constantly to press said lever against the cam 19, or itsequivalent, adapted cyclicall to give said lever a uniform throw.

Cbming now to the novel features of the new combinations to whoseprotection the present application is directed, a flexible band or linkor loop 24 formed of substantially inextensible material, is shown assecured Between the lower end or' a foot25 upon the diaphragm stem 16and the inner end 21 of the lever 17by means comprising screws 26, 26'and clips 27,- 27, -the latter being provided with curved surfaces, asat 28, 28" over which said band, link or loop may be bent withoutavoidable danger of breakage.

Referring to the showing in Fig. 1, the flexible element 24, whether ornot said flexible element is formed from separate strands, as in thecase of a cord or cable, may be circular in cross section and, in thatcase, it may be so bent and disposed with reference to the inner end ofstem 16 and the lever end 21, and also with reference to the clips 27,27, that the flexin thereof shall take place in an inward directlon, butnot necessarily in the plane of reciprocation of the lever 1 Forexample,

connection with. thedotted line showing at' 24' Fig. 1. 1o l arts'shownin Fig. 2 being identified b reference characters heretofore employe butwith the character a added thereto, the

' link 24 may be either circular, in cross sectional outline orofbelt-like character. That is to say, as suggested in Fig. 3,'thethrustrefusing element here referred to may be cut from'tubular stock orformed from a tapelike material cut to suitable length and provided withoverlapping ends, somewhat as suggested at 29, an in case thiselement'isto be'secured by means such as screws 26", 26% and clips 28', 28", thelower end of the loop 24" may advantageously be secured to any actuatingelement, such as the inner end'21 of the'lever 17 by means such as apivoted connection fitting 30", shown as adapted to receive the screw26" and as secured by a transverse in 31. The construction here referredto is obviously such-as largely to obviate unequal distribution ofstrain upon the {Ink or loop 24' during reciprocation of said ever.

As a further alternative, dispensing with the mentioned'screws and clipsas suggested in Fig. 4 the lower end or foot 25" of a valve stem and theinner end 21" of an actuating element, suclr as the lever 17", may berespectiyelyprovided with fixed or rotatable pivot ms 32'', 32" overwhich a flexible loop or link 4': ma be so disposed that, whether or not1t 15 i erently resilient (as suggested by the dot-ted lines 24) it mayautomatically shift its contact with said pins, thereb eflect-ing adistribution of wear which is avorable to advantageously be built upfrom several .gtrands or lies of a flexible but substantially mextensibe material, whether textile, metalhe, or other, in such manner as toassure durability. It will also be noted that the flexible intermediateelements described are preferably so secured as to predispose the sameto- "with an attached handling element for-re- "ment.

long use; and it will be understood that any' of the described bands,loops or links may I claim: v

1. A pressure-responsive pumping organization including a reciprocablepump ng element provided with pressure-responsive resilient means foradvancing the same and m tracting the same, a uniform throw actuatmgelement, and thrust-refusing means in- E terposed between said handlingelement and said reciprecatory element and having the '76 form of aflexible link formed of a substan- Y tially ,inextensible material, thestraightening of which gives a fixed inner limit to intake strokesimparted by said actuating ele- 2. A pressure-responsive pumpingorganization including a reciproca 1e pumping-clef ment providedwithpressure-responsive re silient means for advancing the same and withan attaehed-handling element for retracting the same, a uniform throwactuating element, and a flexible element formed of substantiallyinextensible material and so secured between said actuating element andsaid handling element as to predispose said flexible element towardcontraction and to impart intake strokes which have ,a fixed innerlimit. I i

v 3 .A ressure-responsive pum mg orgamzation including a reclprocab epump ngr element provided with pressure-responsive resilient means foradvancing the same and with an attached handling element for retractingthe same, a uniform throw actuating no element, anda flexible elementformed of substantially inext'ensible material and so se-, cured betweensaid actuating element and said handling element as to predispose saidflexible'element toward contraction, portions of said flexible element'by which the same is secured being dis osed substantially paral V 'lelwith one another and to im art intake strokes which have a fixed innerimit.

4. A pressure-responsive umping organi- 1 1o zation including areciproca le pumping elemerit provided with a pressure-responsiveresilient means for advancing the same and with an attached handlingelement, a uni-v form throw reciprocatory actuating element, and asubstantially inexten'sible 'but flexible element in the form of a loopsecured between said actuating element and said handling element,portions of said loop by whichthe same is secured being disposedsubstantially-mo parallel withone another. substantially parallel zationincludinga reciproca 5. A pressure-responsive pumping-organile pumpingelement provided with pressure-resppnsive resilient means for "advancingthe same 12 and with an attached handling element 'for retracting thesame, a uniform .throw actuating element, and thrust-refusing meansinterposedibetween said handling element and said actuating element andthe form of a flexible linkformed of a plurality of laps of fabric.

6. A pressure-responsive gumping organization including a reciproca 1epun ping element provided with pressure-responsive resilient means foradvancing the same and with an attached handling element for retractingthe same, a uniform throw actuatin element, a thrust-refusing meansinterpose between said handling element and said actuating elementandhaving the form of a flexible link formed of a plurality of la offabric and secured to said actuating e ement by means providing apivotal connection.

In testimony whereof I aflix my signature.

CHARLES W. MoKINLEY.

